GB/T 33835-2017
Test method of impact strength for friction material
ICS 43.040.40
Q69
National Standards of People's Republic of China
Friction material impact strength test method
2017-05-31 released
2018-04-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
China National Standardization Administration released
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard proposed by the China Building Materials Federation.
This standard by the National Non-metallic Mineral Products and Products Standardization Technical Committee (SAC/TC406) centralized.
This standard was drafted. Fujian Huari Auto Parts Co., Ltd., Shandong Province Liangshan divine Auto Parts Co., Ltd., Xiamen Li Xing Bodhidharma
Rub Material Co., Ltd., Ningguo Flying Eagle Automotive Components Co., Ltd., Xianyang Institute of Non-metallic Minerals Research and Design Co., Ltd., Temington friction
Material Technology (Shanghai) Co., Ltd., National Non-metallic Mineral Products Quality Supervision and Inspection Center, Hangzhou West Lake Friction Materials Co., Ltd.
The main drafters of this standard. Pan Yucheng, Shang Xingchun, Su Meizhen, Feng Jingyou, Ye Jialing, Sun Qichun, Li Panfei, Zhang Jianli, Yang Lijun,
Shen Yongsheng.
Friction material impact strength test method
1 Scope
This standard specifies the friction material impact strength test sample preparation and test methods.
This standard applies to resin as a binder made of friction material.
2 test conditions
2.1 The test equipment for the simple beam pendulum impact testing machine, the impact energy is divided into two levels 0.9807J and 3.9228J, impact speed
2.9m/s.
2.2 pendulum, specimen, bearing the size of the three and interrelationships shall comply with the provisions of Figure 1.
2.3 Test consumption of their own energy stored in the full scale of each level of 10% to 80%.
Note. L is the distance between the fulcrums.
Figure 1 pendulum, sample, bearing the size of the three and the relationship between schematic
3 sample preparation
3.1 The thickness of the specimen should be consistent with the thickness of the product in the middle of the product perpendicular to the rubbing direction of non-face sampling. Each batch of product system
Prepare 5 samples.
3.2 Sample size for the length of 55.0mm ± 0.5mm, width 15.0mm ± 0.2mm, thickness 6.0mm ± 0.2mm, the thickness of the sample side
To the surface of the hammer blade positive impact surface, the width of the surface of the product is compressed surface. If the sample width can not meet the 15.0mm ±
0.2mm, it can also be made 10.0mm ± 0.2mm. Depending on the size of the sample, one to three samples may be prepared on a single sample to prepare a sample
Set and size shown in Figure 2.
Figure 2 sample preparation location and size diagram
4 test procedures
4.1 adjust the impact test machine L distance between the fulcrum is 40.0mm ± 0.2mm.
4.2 Select the appropriate pendulum, the load should meet the requirements of 2.3.
4.3 Calibration test machine dial zero, and the pendulum on the pre-pay hook position.
4.4 with a precision of 0.01mm vernier caliper were measured specimen width and thickness. In the middle of the sample 10mm range uniform
Distribution measurement of three points, whichever is the smallest.
4.5 Place the specimen horizontally on the support as specified in 3.2, so that the pendulum blade can hit the entire thickness of the specimen and be aligned
Like the center line.
4.6 Smoothly release the lock hook, so that the pendulum free fall, so that the impact load by the sample and was interrupted by the dial to read the power consumed. test
The sample should be broken in the middle of the 10mm range, otherwise the test results void.
5 calculation
Impact strength of the sample according to equation (1) Calculated.
αK =
AK
b × d
(1)
Where.
αK --- sample impact strength, in units of Joules per square centimeter (J/cm2);
AK --- impact energy consumed by the sample, in joules (J);
b --- sample width, in centimeters (cm);
d --- the thickness of the sample, in centimeters (cm).
Take the arithmetic mean of the test results of the five samples to the reported value, leaving the three di......